brother, i think you need to clean your carby! i`v got 4 triumphs that will tickle and fire up and run on the coldest of days! 32o in the late 80`s [in Tampa Fl, no less!] and the Triumph was the ONLY thing i had that would fire up! rode it to work all the way across town! froze me arse off! took two tickles and two kicks to achieve running status.....
back in the SBR [suncoast british rider] days, i got turned off of Mikuni`s simply by watching [and waiting] wiliest the mickey roony guys started their bikes..they have a cold start enrichener circuit as a choke, lots like an Amal, only far more easily plugged up! .ALWAYS seemed to be a couple that didnt want to fire...once running, they ran great! just didnt want to fire up cold. as a matter of fact, thats about the ONLY prob i have with Mikuni`s!
back around `04, we got a post on the BB.com board about a "show" triumph that would not fire up...bike was at a very nice indy hog shop and it HAS to fire up and ride in for the show...since i was closest to the shop in St Petersberg, i got the call to go chk it out....[ no amount of posted advice was helping this guy and Daytona was approaching fast!]
so i ride over and look!
turns out to be a RAT BIKE! an old triumph chopper with a springer and a craftsman lawn tractor rear end welded on along with dead animal skulls and every bit of buffoonery added you can imagine! bikes name was EZ_RAT and it was a repeated winner in the ratbike class in daytona...so i see the single Mik and ask the tech,
"you chkd fire/timing all of that?"-----YUP!
"howzabout fuel? any in the carb?"----yup!
"with all the kicking you`v been doing, have you seen the plugs wet yet?"---------
"well, NO! these mikunis dont just spew fuel like the old amals do" he tells me.
"izzat so? well, i`m gonna need two things to fire this bike up! a can of carb cleaner and a FIRE EXTINGUISHER!"
at this point the shop owner has started seating PROFUSELY with visions of his shop burning down over some pc-of-shyte like this exploding cause some fool dumped a 1/4 can of carb cleaner down the intake..
...but thats what i did!
bike fired on the first kick and blew one muffler off! [thats ok, it was only wired on!] second kick, bike fires and runs! [not to badly, either!]
i had noticed that the MIK was all sooted up...bike had caught fire [or,,they SET it on fire for extra points!] and the tech wasnt allowed to clean the carb or put new fuel lines or clamps,,,everything HAD to be used or rusted or you would lose points in this class! when i saw the soot i knew that an O ring had swelled shut or varnish had been baked solid in the fuel enrichment circuit and prevented starting! `ell, i saw the trouble some of the guys in the club had firing their MIK equipped bikes and they DID try to keep their carbs clean!
of course, some of the guys had MIK`s and NEVER had a problem firing their machines up........i just noticed that the bikes that didnt want to start, yet we knew ran fine, generally had MIKS!
i have four running trumps right now and only one has the choke slides installed and i`v never used them to start the bike!